You can unsubscribe newsletter on My Z.com (Z.com control panel).
Please follow the directions below:
1. Log in to [My Z.com]
2. Click the icon in the top-right corner and then click [Account Setting]
3. Choose [No, thanks.] at the [News Letter] item under [Z.com Account Contract Information]
*You will receive email regarding notices that effect on your service operation even though you unsubscribed newsletter service.